| | 1 | Author
| Norbert Kuhn, Martin Grathwohl3, Manfred Steimann3, Gerald Henkelb, Herrn | Requires cookie* | | | Title
| .2-Bis( 1' ,31 -dimethy limidazolin-21 -iminato)ethan - ein neuer Chelatligand [1]  | | | | Abstract
| The reaction of 2-imino-l,3-dimethylimidazoline (10, ImNH) with X-CH2CH2-X (11, X = p-CH3C6 H4 S 0 3) gives the diimine adduct ImN-CH2CH2-NIm • 2 HX (12) from which the diimine ImN-CH2CH2-NIm (13) is obtained on treatment with KH. 13 reacts with (C6H5CN)2PdCl2 (15) to give the chelate complex (ImN-CH2CH2-NIm)PdCl2 (16). The X-ray structures of 12 and 16 are reported. | | | |
Reference
| Z. Naturforsch. 53b, 997—1003 (1998); eingegangen am 2. Juni 1998 | | | |
Published
| 1998 | | | |
Keywords
| Imines, Palladium, Chelates, Ligand Effects, X-Ray Data | | | |
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| default:Reihe_B/53/ZNB-1998-53b-0997.pdf | | | | Identifier
| ZNB-1998-53b-0997 | | | | Volume
| 53 | |
| 2 | Author
| Frank Leßmann3, Lothar Beyer3, Rainer Richter3, Reinhard Meusingerb | Requires cookie* | | | Title
| N-Benzoylthiocarbamoyl Amino Acid Ethyl Esters as Chelate Ligands for Transition Metal Ions | | | | Abstract
| The reactions of benzoyl isothiocyanate with amino acid ethyl esters (N-butyl glycine ethyl ester, (S)-(-)-proline ethyl ester) give N-benzoylthiocarbamoyl amino acid ethyl esters. Apart from the expected N-benzoylthiocarbamoyl (S)-(-)-proline ethyl ester the racemic N-benzoyl thiocarbamoyl (/?)/(S)-proline ethyl ester is formed because of base catalyzed racemization of the educt (5')-(-)-proline ethyl ester during the reaction of (S)-(-)-proline ethyl ester hy drochloride with triethylamine. The structures of both compounds were established by X-ray crystal structure analysis and specific optical rotation measurements. The ligands yield neutral 2:1 chelates with Ni , Cu11, Pd11 and Pt11. The carboxylic oxygen atoms are not involved in the chelation. The ligands and the resultant complexes show configurational E/Z isomerism. In the case of the chelates of the racemic N-benzoylthiocarbamoyl (/?)/(5)-proline ethyl ester, additional R/S isomerism is observed as shown by | | | |
Reference
| Z. Naturforsch. 53b, 981—990 (1998); received November 11 1997 | | | |
Published
| 1998 | | | |
Keywords
| Thioureas, Amino Acid Ethyl Esters, Chelates, NMR Data, Crystal Structure | | | |
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| default:Reihe_B/53/ZNB-1998-53b-0981.pdf | | | | Identifier
| ZNB-1998-53b-0981 | | | | Volume
| 53 | |
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